Lawn-mower sharpener.



PATENTED JUNE 23, 1908.

J. FEJHOGKER & B. M. SMITH.

LAWN MOWER SHARPENBR.

APPLICATION FILED JAN. 9, 1908.

" lll m WITNESSES y 1 A dorm F. HOCKEFT,

BENJAMIN NLQMITH V ATTO KS using a rotary attachment.

' end B UNITED" STATES Pa rs.

t me;

JOHN 'F. nocnnn AND BENJAMIN M. snrrn, or MONRGE, Iranian:

LAWN-MQWER SHARPENER.

To all whom it may concern: I

Be it known that we, JOHN F. Hooxae and BENJAMIN M. SMITH, citizens of the United Lawn-Mower Sharpeners,.' of which thefollowing is a specification.

ur invention relates to improvements in Sharpeners for the knives of lawn. mowers reel or blade carrier, the'object of our invention being to provide a device which shall be simple, cheap, durable in construction and one which may be easily and quickly attached to an ordinary lawn mower, and one which may readily be adusted to varying conditions of structure. I -\Our invention therefore consists in certain novel features of construction, arrangement, and combination of parts as will be hereinafter fully describedand pointed out in the claims, reference being-had to the accompanying drawings, in which Figure 1 is a vertical section showing aplication of our device to..a lawn mower. ig. '2 is a detail face view of one end of the sharpener board. Fig. 3 is a pore ective view of our attachments detached cm a mower. Fig. .4 shows a different mode of attachment, and Fig. 5 still another mode of In carrying out our invention We'use a board A which may be of wood or other suitable material, the upper face of which is coated with emery formin upper face of the board s ants as shown, so

that the front edge of the board is thinner than the rear edge.

board A near each end is secured a fiat metal To the under face of the rigid bar B which is twisted so that the free right angles to the main body of the bar B; to the outer ends of said portions B are pivotally secured by bolts or rivets b the angular slotted arms. 0, said slotted arms C adapted to be bolted by means of slots C to the slotted arms D which carry the usual wooden roller the arms I) are provided with bolt holes for the )urpose of attaching the same to the mower irame or to the axle of the wooden roller E forming a part of most of the lawn mowers in common use, which use a rotary knife reel. F and a stationary shearing plate or blade G. 7

ur improvement may be ap lied to the mower in several ways, one of w 'ch we'will "Specifieationof Letters Patent. Appfication filed January s, 1902. Serial a 409,991.

- floor or sidewalk will all shear clear across acoating A; the I stands in a plane at substantially Patented dune .53, teen.

board A is then brought to its proper adjust meet by ing lightl with a hammer at the point in icatedg-by is then run on a smooth surface such as the until a sharp edge is produced on the knives of reel F, whereu on all knives will be ground to anexact circ sand shearing blade, when to the knife reel.

' Another way to apply the attachment is to i remove the wooden roller from its slotted arms D whi frame, and

bolt the arms 0* totheslotted arms D b the bolts c" as shown in Fig. 4.

In near y all lawn mowers now in common use algolt 1s furnished which is usually of the same size as our bolts 0; this belt is the one 8Q that bolts the adjustable roller arms D to the" side of the mower frame toregulate the roller for different lengths of grass; this method of atta'chin is similar to that mower is used instead of the with our attachment, but as the bolts belonging to the mower may be too short, our bolts are'furnished with our attachments.

It will thus be seen that we produce a sirn 9 is, cheap and efiicient devicefor sharpening awn mower knives, which can be readily applied to and detached from the usual lawn mowers in common use.

It will of course be understood that changes 95 in the form, proportion, and minor details of construction may be'resorted to without a material modification or departurefrom the spirit of our invention.

The shearing guide or rest renders our grinding board pos1- tive, sure and accurate in its grinding action.

The slotted arms C are bent in angular shape as shown in order that the sharpener board may extend entirely across the mower and rest accurately at all points on the shearin bar G.

Ve claim: 1. A sharpening device for reel lawn mowers, consisting of a sharpener board adapted 110 to rest upon the upper face of the shearing bar of the mower when said mower 1s m shaming plateso A; the lawn mowersrthe bed or the it is again adjusted up 'ch are carried by the mower shown inFig. 7 except amt the bolt furnished with the bolts furnished blade or plate forming a ers consisting of a s ar to rest on and be gui e by the upper face of ."the shearing bar of the mower when the "mower is in its normal operative posit-ion,

cent tolits en rigid-arms prrgpctin from said board adjlaan slotted arms pivota 1y qseepred to; the free ends of the rigid arms.

- 3. A sharpening device for reel lawn mowers consisting of a sharpener board adap rest upon the upper face of the shearing bar "of the mower, and havin ted to its upper surface beveled downwardly and forwardly, rigid arms secured to said board adjacent to its ends, and slotted arms pivotally secured at one end to the free ends of the rigid arms and their slotted portions to the frame of the mower.

4. A sharpener for lawn mower knives comprising a sharpener board adapted to rest on and be guided by the shearing bar of the mower, rigid bars attached to said sharpener board at or near the ends thereof, angi'e lar bent and slotted arms )ivotally secured to the free ends of said rigid bars, and means for securing said slotted angular bars to the mower frame.-

JOHN F. HOOKER. BENJAMIN M. SMl'lll. Witnesses:

J. W. EVERIIART,

J. A. IIENDRIUKS. 

